InChI=1S/C12H12O8S/c13-12(14)10(20-21(15,16)17)3-1-2-8-4-5-9-11(6-8)19-7-18-9/h1-2,4-6,10H,3,7H2,(H,13,14)(H,15,16,17)/b2-1-